Hair cover



FIG. 1 is a side elevation view of a hair cover.

FIG. 2 is a front elevation view of the design of FIG. 1; and,

FIG. 3 is a rear elevation view of the design of FIG. 1.

Portions of the hair cover not shown in the drawings form no part of the claimed design. 

The ornamental design for a hair cover, as shown and described. 